The perception of taste is remarkably complex, not only on the tongue but in organs throughout the body.
The idea that specific tastes are confined to certain areas of the tongue is a myth that “persists in the collective consciousness despite decades of research debunking it.” Also wrong: the notion that taste is limited to the mouth.
Causes less air pressure at the upper side, so the lower side pushes up, no?
And the upside down flying is simply due to gliding mechanics, no?
Nope. Read the link, it’s fascinating and complicated.